Science
Mechanism of Action
With a Hydrophilic-Lipophilic Balance (HLB) value of approximately 4.0, this ingredient reduces interfacial tension to facilitate the creation of stable water-in-oil emulsions or support co-emulsification in oil-in-water systems. It functions as a skin-conditioning agent by forming a breathable, light emollient film over the stratum corneum, preventing moisture loss without a heavy residue.
Research
Clinical Evidence
High confidence3%
Key findings
- 01 Safety assessments of related alkyl PEG ethers demonstrate that concentrations up to 3.0% remain non-irritating to intact skin, with irritation potential only increasing as levels reach or exceed 5.0%.
- 02 Technical evaluations confirm its efficacy as a primary pigment dispersant and emulsion stabilizer within the 1.0% to 5.0% range.
Transparency
Dusting Analysis
As a functional emulsifier rather than an active, it is rarely 'dusted' for marketing purposes; however, concentrations below 1% may indicate it is used only as a secondary stabilizer rather than a primary skin-conditioning agent.
The Formula
Formulation
Stability
Maintains peak stability within the skin’s physiological pH (4.5–6.0). It is susceptible to hydrolysis—the breaking of chemical bonds—in environments with extreme acidity (pH < 3.0) or alkalinity (pH > 9.0).
Synergies
- Oil-soluble vitamins
- Mineral pigments
- W/O co-emulsifiers
Conflicts
- Strong oxidizing agents
- Strong acids
- Strong bases
- Nitrosating agents
Safety
Safety Profile
Safety is contingent on the purification process to ensure 1,4-dioxane levels remain below 1 ppm. Due to potential nephrotoxicity associated with PEG-based compounds in systemic medical applications, it should not be applied to severely damaged or burned skin.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A reliable and skin-compatible emulsifier that bridges the gap between formulation stability and emollient skin-feel.
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References
Sources